MaxValueInArray.kt

    val numbers = listOf(1, 2, 4, 5, 3, 6, 8, 7)

    var max: Int
    var i: Int

    when(numbers.size % 2 != 0) {
        true -> {
            max = numbers[0]
            i = 1
        }
        false -> {
            if(numbers[0] < numbers[1])
                max = numbers[0]
            else
                max = numbers[1]

            i = 2
        }
    }

    while(i < numbers.size) {
        when(numbers[i] < numbers[i + 1]) {
            true -> {
                if(numbers[i + 1] > max) max = numbers[i + 1]
            }
            false -> {
                if(numbers[i] > max) max = numbers[i]
            }
        }

        i += 2
    }

    println("max: $max")

Explonation:
https://www.enjoyalgorithms.com/blog/find-the-minimum-and-maximum-value-in-an-array